INSTRUCTIONS:
In a small bowl combine, flour, baking soda, salt and cinnamon and whisk together.
In a large bowl or mixer bowl beat butter until smooth and whipped. Add sugars and beat together until light, fluffy and well combined.
Scrape down the bowl, (unless you have a beater blade with I highly recommend), add egg and vanilla mixing until just combined.
Add flour mixture in two parts, mixing both on low until almost combined.
Add oats and chocolate chunks and mix on low to just combine.
Refrigerate the dough for a minimum 30 minutes.
Preheat oven to 325F. Using a medium scoop place a round on to a parchment/silpat lined baking sheet.
Bake the cookies for 14-16 minutes, until golden brown. This will get a soft chewy cookie, if you like a harder cookie, cook a few minutes more.
Let cool on a pan a few minutes, then transfer to a wire rack to cool completely.
Store in an airtight container.
To Make Gender Reveal Sandwiches :
Separate out about a 1/4 of the buttercream and colour it to pink or blue.
Place the coloured and plain buttercream into to separate piping bags.
On the bottom center of one cookie, add the coloured buttercream, then circle it with the plain buttercream.
Place another cookie on top , then roll in sprinkles.